20778324 has 96 divisors (see below), whose sum is σ = 59781120. Its totient is φ = 5484672.

The previous prime is 20778323. The next prime is 20778353. The reversal of 20778324 is 42387702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20778323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74874 + ... + 75150.

It is an arithmetic number, because the mean of its divisors is an integer number (622720).

Almost surely, 2^20778324 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20778324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29890560).

20778324 is an abundant number, since it is smaller than the sum of its proper divisors (39002796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20778324 is a wasteful number, since it uses less digits than its factorization.

20778324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 20778324 is about 4558.3246922526. The cubic root of 20778324 is about 274.9182081824.

It can be divided in two parts, 2077 and 8324, that added together give a palindrome (10401).

The spelling of 20778324 in words is "twenty million, seven hundred seventy-eight thousand, three hundred twenty-four".